aeh5040 Posted November 23, 2010 Posted November 23, 2010 Here is something I've been wanting to make for a long time, finally made possible by Zblj's amazing design for Mecanum wheels. Like Zblj's and esrtiece's impressive vehicles, it can drive and turn in any direction. What makes this one different is that it is controlled by a system of differentials (similar to an add/subtract mechanism but a little more complicated). This means it can be controlled by just 3 motors: one for forward/reverse, one for sideways, one for turning. With a lot of effort I was able to get the mechanism quite compact - it uses only 4 differentials. I usually settle for pure functionality, but this time I made some attempt at styling too . Enjoy! Quote
2LegoOrNot2Lego... Posted November 23, 2010 Posted November 23, 2010 I like it a lot. About your attempt at styling, I think you did a great job. It works realy well and it looks good as well... I have to get into this add/substract steering system some day. It works with differentials, I know but that is all to me right now... Maybe I'll build a copy of yours some day and figure out how it works. At the moment I am to bussy with my model of the Elphinstone Easyloader Road Train, I can't find time to do so right now... Again, I love it and keep it up... Quote
rien Posted November 23, 2010 Posted November 23, 2010 hello nice car! Can you post a pict from the remote control i like the joystik desing Are there instruktions for them? I want to use them on my 8043. greetz Rien Quote
Zerobricks Posted November 23, 2010 Posted November 23, 2010 Wow its really compact! I like it a lot! bye the way where did you get black bewel 12 tooth gears? They look awesome! Quote
Tobbe Arnesson Posted November 23, 2010 Posted November 23, 2010 Impressive! I bet this makes control a lot easier! I have bought all the pieces to build Zblj's smooth wheels (12 x 2) and when I get around to build them I think I have to try and replicate your differential design as well! Zblj: The black 6589 Gear 12 tooth bevel came in 3806 Gigamesh G60 and 3809 Technojaw T55 according to http://www.bricklink.com/catalogItemIn.asp?P=6589&colorID=11&in=A Quote
Jurgen Krooshoop Posted November 23, 2010 Posted November 23, 2010 I think the most impressive part of this MOC is the transmission. The way the 3 differentials are used for controlling the car is amazing Quote
Milan Posted November 24, 2010 Posted November 24, 2010 Really awesome mechanics! I like the controller, too! Quote
aeh5040 Posted November 25, 2010 Author Posted November 25, 2010 (edited) Thanks all for the kind remarks! @2LegoOrNot2Lego...: Yes, by far the best way to understand an add/sub mechanism is to build one! I would start with the basic 2-differential version, for which there are many designs avaiable, e.g. here. Basically, it lets you control a tank-style vehicle using one motor for forward/reverse and one for turning. Here I used a more complicated variant to handle 4 wheels and 3 motions. I used something somewhat similar for a Killough platform here. @Zblj: needless to say, none of this would be possible without your wheels! I must indeed have got the black 12t bevel gears from Gigamesh - I didn't plan this, but was happy to find I had them! The black 20t double bevels are more common, of course. @rien: yes, below is the joystick (probably this is enough to understand how it's made). And I'm working on instructions for the whole thing... There are several other joystick designs around, e.g.: this thread And here are some more pics. Edited November 26, 2010 by aeh5040 Quote
Myrtonos Posted April 19, 2012 Posted April 19, 2012 One issue I have noticed that the shape of the rollers, they are thouroughly cylindrical, they shoud have a convex profile as to follow the curvature of the wheel. Quote
imajor Posted April 19, 2012 Posted April 19, 2012 I remember reading this topic when it was first posted, and I was really impressed. Then I was trying to search for it, but for some reason I couldn't, so thanks Myrtonos for bumping it again. I love complex builds, and I think this is the best I've ever seen. I still don't understand how it works, if I had the parts, I would build this right away. If this was an official set, it would be an immediate buy for me. Grats! Quote
Tomik Posted April 20, 2012 Posted April 20, 2012 This model and mechanism are simply awesome! I like it much and I don't understand much how it works same as others. Quote
aeh5040 Posted April 21, 2012 Author Posted April 21, 2012 Thanks for the renewed interest in this little model! This has prompted me to finish making the instructions: http://www.brickshelf.com/gallery/aeh/Lobster/LDraw/lobster.mpd http://toad.net84.net/lobster/ Quote
Burf2000 Posted May 9, 2012 Posted May 9, 2012 This is pretty interesting to look at. Good job! Quote
Jim Posted May 9, 2012 Posted May 9, 2012 I like it a lot. About your attempt at styling, I think you did a great job. It works realy well and it looks good as well... Again, I love it and keep it up... Absolutely nothing to add to this! Quote
KEvron Posted May 9, 2012 Posted May 9, 2012 I like it much and I don't understand much how it works same as others. an affliction i suffer all too often. i've found that the only remedy is to try to build the thing, myself. application makes the abstract more tangible. KEvron Quote
gotoAndLego Posted May 9, 2012 Posted May 9, 2012 How does it do on carpet, both shag and oriental rugs? Quote
aeh5040 Posted May 10, 2012 Author Posted May 10, 2012 How does it do on carpet, both shag and oriental rugs? It does fine on low carpets (in fact it is a little smoother), but gets bogged down on thick ones... Quote
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